Smitten Keira Knightley gets her leg over James Righton in back of a taxi

Keira Knightley looked utterly smitten with her fiancé James Righton as the pair canoodled in the back of a London cab after a romantic dinner date.

Keira Knightley flaunted her engagement ring as she and her fiancé James Righton from the Klaxons left the Wolseley restaurant in London (Picture: XPOSUREPHOTOS.COM)

The 27-year-old actress gazed into the eyes of her Klaxons star beau as they made their way home from the exclusive Wolseley restaurant in the West End.

Keira dressed down in a denim jacket and black floor-length dress which she accessorised with a tan leather belt and matching bag.

She drew attention to her sparkly engagement ring with a bright red manicure and managed to flaunt her perfect pins as she straddled her rocker fella at the end of the evening.

The Atonement actress took the opportunity to show off her long limbs (Picture: XPOSUREPHOTOS.COM)

James also looked relaxed in a T-shirt, chinos and trainers.

Keira started dating the 28-year-old rocker early last year after they were introduced by mutual friend Alexa Chung, and last week a spokesperson confirmed the pair were engaged after 15 months together.

The loved-up couple have reportedly celebrated their impending nuptials by splashing out on a £2.4million townhouse in Spitalfields, east London.

The couple announced their engagement last week (Picture: XPOSUREPHOTOS.COM)

Keira previously dated her Pride & Prejudice co-star Rupert Friend but the pair split after five years together in January 2011.

Her father said of the break-up: ‘It wasn’t a decision that either of them took lightly.

‘I know they gave it a great deal of thought.

‘I don’t think there was any one thing that led to their break-up – it was a whole raft of things, I think.’